Keywords

Blind channel estimation, CDMA, RAKE receiver, SVD

Abstract

A new multiuser detection scheme based on signal
subspace estimation is proposed. Blind channel estimation
technique estimate the channel coefficients and those
channel coefficients are used by the rake receiver to
estimate the bits. The existing blind methods suffer from
high computational complexity and sensitivity to accurate
knowledge of the noise subspace rank. In this paper a
blind adaptive implementation based on a signal subspace
tracking algorithm is proposed. The proposed method
estimates the noise subspace by a simple matrix power
that is computationally efficient and requires no
knowledge of the noise subspace rank. Using the
estimated noise subspace channel impulse response is
identified by using a low dimensional SVD which reduces
the computational complexity significantly.